I just spent some time trying to build
flannel and since there were
some nuances, I decided to list the instructions here.
Install build dependencies:
sudo apt-get install linux-libc-dev golang gcc
Make Go directories:
mkdir -p ~/go/src cd ~/go/src export GOPATH=~/go
git clone https://github.com/coreos/flannel.git
Install Go dependencies:
cd flannel go install
Since I wanted a statically linked binary, I edited the Makefile and updated the build instruction like this:
dist/flanneld: $(shell find . -type f -name '*.go') go build -o dist/flanneld \ -ldflags '-extldflags "-static" -X github.com/coreos/flannel/version.Version=$(TAG)'
Now build the binary:
flanneld binary should now be created in the dist directory. You
can strip it to make it smaller:
One other problem I encountered was that you need at least 2GB of RAM for this. I was trying this in a VM with 1GB and I ran out of memory.